How to Calculate Heat Lost or Gained in a Reaction?

[HelloMotto]

0.100 mol/L + 23 ml of Potassium Hydroxide is mixed with 18 ml of hydrobromic acid. Calculate the heat gained or lost by the reaction.

The initial temperature was 20.1 celcius and the final was 24.5 celcius.

i have no clue how to solve this equation. Can someone give me clues and what equation to use?

 

[chemisttree]

The only important information you have is that 41 mL of solution is heated from 20.1 C to 24.5 C. You need the heat capacity and density of that solution (either given or make an assumption) to complete the calculation.

Do you know of a relationship between heat and temperature change, volume (mass?) and heat capacity?

 

[Blueshift5]

To calculate the heat gained or lost by a reaction, we can use the equation Q = mCΔT, where Q is the heat gained or lost, m is the mass of the substance, C is the specific heat capacity, and ΔT is the change in temperature.

In this case, we need to first determine the mass of the substances involved in the reaction. To do this, we can use the given concentrations and volumes to calculate the number of moles of each substance. From there, we can use the molar mass of each substance to calculate the mass in grams.

Once we have the mass of each substance, we can use the specific heat capacity to calculate the heat gained or lost by each substance. The specific heat capacity of a substance is the amount of heat required to raise the temperature of 1 gram of that substance by 1 degree Celsius.

Finally, we can calculate the total heat gained or lost by adding up the heat gained or lost by each substance involved in the reaction.

In this specific case, we would need to use the molar mass of potassium hydroxide and hydrobromic acid, as well as the specific heat capacity of each substance, to calculate the heat gained or lost. We would also need to take into account the change in temperature, which is given as 24.5 - 20.1 = 4.4 degrees Celsius.

Without these specific values, it is not possible to provide an exact calculation. However, using the equation Q = mCΔT and the information provided, we can calculate the heat gained or lost by this reaction.